Method of and apparatus for drawing glass



Nov. 24, 1931. A. E. SPINASSE METHOD OF AND APPARATUS FOR DRAWING GLASS.

Filed July 51 1926 f Patented Nov 24, 1931 UNITED STATES PATENT oar-Ice ARTHUR. I. 01' IO'UIT VERNON, OEIO, AS8IGNOB '10 rnrsnmrr' m GLASS OOIPANY, A. OOBJPORATION OI PER'NSYLVAHIA.

III-HOD Oil AND APPARBi'IUfl-IOB DRAWING GLASS Application me m :1, ma. Serial no. mass;

The present invention relates to improvements in method of and apparatus for drawing glass, and is a continuation in part of my simi arl entitled co-pgnding application Serial 0. 702,198, filed arch 27 1924.

It is an ob'ect of the invention to provide an improv method and apparatus for drawing the flat sheets of glass of substantially uniform thickness to and including the edges or mug: portions of the sheet, and to prevent the 'nkin inwardly of the edgles of the sheet as the eet is drawn upwa'r y from the lass bath.

With t e foregoing and other objects in- 5 view, the invention will be more fully described hereinafter, and will be more particularly pointed out in the claims appended hereto. v

In the drawings, wherein like symbols so refer to like or corresponding parts throughout the several views,

Figure 1 is a fragmentary top plan view of an apparatus constructed according to the present invention.

Figure 2 is a vertical section through the same.

Figure 3 is a perspective view of one of the slot members emplo ed.

Fi ure 4 is an en view of the slot member so showing a portion of the glass bath and the glass sheet drawn therethrough, and

Fi re 5 is a similar view showing a slight modi cation.

Referring more particularly to the drawings, 1 des1gnates one of the walls of the furnace containing the molten lass'or the glass bath 2, and 3 represents't e sheet of lass which is drawn upwardly from the bath y an appropriate bait or other drawing tool the sheet being drawn through the drawing rolls 26. f

In F1 re 1, shield members 27 are shown as placed arallel with the drawn glass sheet 3 to out o and regulate the furnace heat from the side portions of the sheet. In Fi re 1, are also shown the burner jets toocally increase or decrease the tem rature in the re on where the edges of the s cat are drawn. or convenience in illustration only one edge of the glass sheet is shown but itwill be understood that the same parts ma cated at the opposite edge of the s set. j-

In accordance with the invention I provide a slot member 10 preferably in the form of a plate, as shown more particularly in Figure 3. The plate is made with a slot 7 and the plate may be made of metal, refractory clay or other material. The slot 7 maybe tapered if desired, narrowing upwardly as indicated in Figure 4, and the slot may be wider at its outer open portion and taper inwardly to the acute angle portion 11-.

The plate 10 is perforated to receive the substantially vertical pivot bolt or pin 18 b which the plate may swing in a horizontal p ane for urposesof adjustment. The pin 18 adjusta ly secures the plate 10 to the slotted link member 17 having the horizontall disposed closed slot. This link member 1 is secured to the pedestal or base member 16 having the vertical slot 19. A bolt or pivot pin 21 is made to pass through the slots 20 and 19, whereby to secure the link member 17 in adjusted position. The link member may be ad usted up and down the pedestal or base member 16; it may be adjusted horizontally by virtue of the slot 20, or it may ivot in a substantially vertical plane about t e pin or fulcrum 21. A heating and cooling means inay be rovided in conjunction with the slot mom er if desired and in Figure 2, 1 i1 lustrate one form of such device as consistin of the pipe 45 bent upon itself and supporte as upon the arm '15. The pipe is rovided with a valve 25 in its induction branc tooontrol the flow of the cool or b thereto. The big'ht of the pipe may be disposed close to the portion of the plate 10 or glass edge forming member which is close to or in contact with the edge of the sheet. It will be understood that although the side walls of the slot in the slot member are shown as straight, these walls may be rounded, as

shown in Figure 5.- I

In the furnace wall 1 is shown a'pocke't or channel 24 extending close to the point of generation of' the edges of the sheet, and in this channel or pocket I dispose a pipe or nozzle 23 for conveying tem erature-afiecting medium to the pocket or c annel under the the viscosity of the glass at the source ofthe drawn edge.

According to the improved method and 5 operation of the apparatus, the lass is gath ered uponan appro riate tool mm the free natural surface of t e bath 2, whereby glass of high qualit may be drawn, such as would be impractica le from dies or other devices up through which the glass is forced by hydrostatic pressure. At the base of the drawn sheet, when thus freely drawn, a thickened ortion 4 naturally forms from the free surace of the bath. This portion forms in inverted V-shape. The slot members are placed above the bath of lass but in osition to receive this thickened or wedge s aped portion of the lass at the edge and border portion of the orming sheet to partially reduce this thickened portion.

Necessarily a retarding frictional action upon the upwardly drawn lass takes place in the slot member resulting in the longitudinal stretching of the border portions of the sheet from the drawing tool to the slot members and this will also result in counteracting the transverse shrinkage of the sheet between the stretched border portions. Although it is not necessary that the glass adhere to the wall of the slot member, I prefer that the glass adhere thereto. The member is preheated to secure and maintain such adhesion, such adhesion producing a better edge and a better tem r in the sheet. By use of the pipe or ot er device I am enabled to regulate the de cc of the adhesion to insure that the wu l th of the sheet will be maintained uniformduring drawing and to produce an edge of desired thickness. At times the jet 24 may be put into operation to control the anchorage at the source of the drawn edge. The plate 10 serves to protect the drawn edge of the sheet from the radiating heat from the bath. By reason of the position of the preheated edge forming members, the same are maintained hot and therefore adhere to the drawn glass. By use of the invention much breakage is eliminated.

From the above it will be understood that the edging members have slots'which engage I the ta ermg base of the drawn glass at a point low the upper reduced end of the tapering base. said slots being narrower than the normal thickness of said tapering base at the point of engagement therewith to partially reduce the thickness thereof, and being wider than the thickness of the finished edges of the sheet to create a dragging action at the contracted portion of the tapering base and at the same time preserving sufiicient tapering thickness above the contracted portion to prevent injuryto the draw. 4

What is claimed is 2-- 1. In apparatus for drawing sheet glass so from an open bath of molten glass at a parr E control of a valve 25' to increase and decrease;

ticular level, an ed ng device comprising a hotplit supporte above the bath and having an open ended, \lr-shaped slot therein to receive the formirig borderh brtion of the sheet being drawn, the wa s which ,form

the slot in said plate being adapted to contact and adhere against the side faces of the forming border portion of the sheet, and the plate being of such form as to protect and shield the said border portion passing through and above the slot from the glass bath below.

2. In apparatus for drawin sheet glass 1 from an open bath of molten g ass at a particular level, an edging device comprising a hot plate supported above the surface of the bath, said plate having an open ended V- shaped slot therein wider at all ints of contact with the glass than the finis ed thickness of the border portion of the sheet being drawn to receive the initially thickl drawn portion of the formin sheet bein rawn, the walls forming the s 0t in said p ate being adapted to contact and adhere a ainst the side border portion and prevent t e narrowing of the 3. In apparatus for drawing sheet glass, the combination with a receptacle adapted to contain an open bath of molten glass at a particular level, a hot plate fixed wholly spaced above the surface of the bath adjacent the wall of said receptacle and having an open ended V-sha ed slot therein to receive the forming b or er portion of the sheet being drawn the walls which form the slot in said plate being adapted to contact and adhere against the side faces of the forming border portion of the sheet, said plate being of such form as to protect and shield said border portion passing through and above the slot from the glass bath below, and means independent from said plate for modifying and controlling the temperature of the glass ad'acent the wall of said receptacle beneath sai plate.

4. In apparatus for drawing sheet glass, the combination with a receptacle adapted to contain a bath of molten glass at a particular level, an edging device comprising a hot plate horizontally disposed in fixed osition spaced above the bath and havin a slot therein for receiving t e formin border portion of the sheet bein drawn, t e walls which form the slot in sai plate being adapted to contact and adhere against the side faces of the forming border portion of the sheet, and the plate being of such form as to protect said border portion above the slot from the bath below.

5. .In apparatus for drawing sheet glass from the free normal surface of a bath of molten glass, horizontal plates with V-shaped slots therein spaced in fixed position above -shaped open 1 the glass bath through which the initially drawn border portions of the sheet are drawn whereby to reduce in thickness and stretch said border portions, said slotted plates bein positioned intermediately of the invente wedge-shaped base ortions of the drawn sheet to permit-are uced tapering portion of glass to pass above the slotted plates before being drawn into final reduced thicknws w in the glass edges. 1

6. In apparatus fordrawing a sheet of glass from an open bath of molten glass, horizontal plates fixed wholly spaced above the surface of the bath and having open ended \l-shaped slots therein through which the borderportions ofthe sheet pass and shape in desired thickness during drawing. i j .7. In apparatus for revving a sheet of lass from an open bath of molten glass,v 29' orizontal plates fixed wholly spaced abovethe surface of the bath and having open ended V-shaped slots therein through which the border portions of the sheet pass and shape in desired thickness during drawing, and means for regulating the positions and temperature of said plates during drawing. 8. In apparatus for drawing sheet glass from a bath of molten glass, means for drawing the sheet from the free surface of the bath, and slotted fixed means with V-shaped slots therein supported wholly s aoed from the bath and engaging the rising order pore tions of the sheet being draw 9. In apparatus for drawing sheet glass from an open bath of molten glass, hot slotted means with V-shaped slots therein fixedly supported spaced above the surface of the 1 bath to adherently embrace the rising border portions of the sheet being drawn from said 40 open bath of molten glass.

- In testimony whereof I afiix no signature.

ARTHUR E. SP .ASSE; 

